AKM EM-3242 Non-contact Magnetic Angle Sensor

AKM’s (Asahi Kesai) EM-3242 non-contact magnet angular sensor detects the absolute angular position of a small magnet that is positioned above the device surface. The sensor has a full 360 degree angle range with a 10bit resolution.

The sensor incorporates IMC (Integrated Magnetic Concentrator) and CMOS Hall devices to sense the magnetic field vector along with the circuitry to convert the Hall sensor signal to an analog voltage proportional to the angle position of the magnet. The sensor is packaged in a very small 6 pin SOIC which is one on the smallest integrated angle sensors on the market. Only one external component is required for operation (a 0.1µF bypass capacitor). The EM-3242 is a low power sensor requiring 2.7 to 3.3V and 8mA.

The EM-3242 has replaced the EM-3241 that is obsolete

Features

  • Small Size 3.6 x 3.0 x 0.8 mm – 6pin SOIC
  • Resolution of up to 10 bits (0.36 deg)
  • Non-linearity – 1%; (Vop <3V)
  • Low Power – Typically 8 mA at 3.0V
  • Sleep Mode – 1µA current draw
  • Linear ratio-metric analog output voltage proportional to 0-360 degree
  • Single 3V supply (2.7 to 3.3 V operating)
  • Only one external part required – 0.1µF Capacitor
  • Very High Speed

Applications

Non-contact angle sensing for:

  • Control valves
  • Audio or light intensity controls
  • Solar panel orientation
  • Gas and fluid flow meters
  • Gas and liquid level indicators
  • Flapper valves
  • Wind direction vanes
  • Motor shaft angle and speed
  • Steering systems
  • Linear position sensing

Tech Support

  1. AKM Magnetic Sensors Engineering and Development Kit Guide
  2. AN_181 Application Notes, Revised May 2012
    Non-Contact Angle Position Sensing IC, Application Notes
  3. RD101-EM3242, Revised October 2013
    Non-Contact Angle Sensor without “In Range” Detection – Reference Design
  4. RD102-EM3242, Revised October 2013
    Non-Contact Angle Sensor with “In Range” Detection Reference Design

Accessories

AN_133KIT EM-3242 Non-Contact Angle Sensor without “In Range” Detection (obsolete)

This kit is useful for evaluation the AKM EM-3242 angle sensor in non-contact angle position sensing applications.The sensor works well with smaller magnets, but with less air gap. See Reference Design

RD101_EM3242 for details. The kit contains a small 0.25” square assembled priUnted circuit board with a EM-3242 soldered onto the PCB and a flat ribbon cable. Also included is a SmCo24 0.25” diameter round magnet and a 0.25 square magnet that have been magnetized across their diameter.

AN_133KIT Data Sheet

AN_134KIT EM-3242 Non-Contact Angle Sensor with “In Range” Detection (obsolete)

This kit is useful for evaluation the AKM EM-3242 angle sensor in non-contact angle position sensing applications with "in range" detection. The Sensor incorporates an “Out of Range” detector circuit and will fault the output to zero volts when the magnet’s strength is either too weak or too strong, see Reference Design RD102_EM3242 for details. The kit contains a small 0.25” square assembled printed circuit board with a EM-3242 soldered onto the PCB and a flat ribbon cable. Also included is a SmCo24 0.25” diameter round magnet and a 0.25 square magnet that have been magnetized across their diameter.

AN_134KIT Data Sheet

Accessories and Permanent Magnets

Permanent Magnet for Angle Sensing - 55B0081

A 3.81mm diameter x 3.81mm SmCo permanent magnet that is polarized across its' diameter rather than axially. Compatible with the EM-3242 and may be mounted into the M250-1.0 Magnet Holder (shaft).

55B0081 Outline Drawing

55B0082 Magnet

Permanent Magnet for Angle Sensing - 55B0082

A 6.35mm diameter x 3.81mm SmCo permanent magnet that is polarized across its' diameter rather than axially. Compatible with the EM-3242 and may be mounted into the M250-1.0 Magnet Holder (shaft).

55B0082 Outline Drawing

55C0126_Magnet_515

Permanent Magnet for Angle Sensing - 55C0126

A 6.35mm square x 2.55mm thick SmCo permanent magnet that is polarized across its' width rather than depth. Compatible with the EM-3242.

55C0126 Outline Drawing

Pricing

Part No.DescriptionQtyPriceIn Stock
EM-3242

Non-contact Angle Sensor, 360°, 10bit1,2

10+
50+
100+
500+
1000+
2500+
5000+
$3.33
$2.70
$2.44
$1.96
$1.72
$1.54
$1.43
Quantity Price
1 - 9 $3.33
10 - 49 $3.33
50 - 99 $2.70
100 - 499 $2.44
500 - 999 $1.96
1000 - 2499 $1.72
2500 - 4999 $1.54
5000+ $1.43

Accessories

Part No.DescriptionQtyPriceIn Stock
55B0081

Cylindrical Permanent Magnet, SmCo24, 3.81 dia. x 3.81mm thick1

10+
50+
100+
500+
1000+
2600≤
$1.35
$1.21
$1.11
$1.00
$0.92
Please Ask
55B0082

Cylindrical Permanent Magnet, SmCo24, 6.35 dia. x 3.8mm thick

10+
50+
100+
500+
1000+
2600≤
$1.50
$1.35
$1.15
$1.11
$1.02
Please Ask
55C0126

Square Permanent Magnet, SmCo24, 6.35 square x 2.5mm thick1

10+
50+
100+
500+
1000+
2600≤
$1.35
$1.21
$1.11
$1.00
$0.92
Please Ask
Quantity Price
1 - 9 $1.35
10 - 49 $1.35
50 - 99 $1.21
100 - 499 $1.11
500 - 999 $1.00
1000 - 2599 $0.92
2600+ $0.87
M250-1.0

Shaft with 55B0082 Cylindrical Permanent Magnet

$25.00
M250SQ-1.0

Shaft with 55C0126 Square Permanent Magnet

$25.00

Notes:

  1. Minimum purchase quantity for EM-3242, 55B0081, 55B0082 and 55C0126 is 10 pieces.
  2. IC Quantities less than 5000 are sold in cut tape. Quantities of 5000 and higher for ICs are supplied in tape reels of 5000 pieces per reel.

Terms and Conditions

Terms and Conditions:

Shipments can be made to Canada, USA, Mexico and Central America. For other countries, please contact AKM (Asahi Kesei Microdevices).
Prices are expressed in U.S. Dollars, FCA San Carlos, California.
Prices are subject to change without notice.
Quantity discounts are available as shown above.

Payment:

Visa, MasterCard, Amex, or Net 30 days (subject to credit acceptance).

Delivery:

Small quantities typically from stock. Larger quantities up to 90 days.

All orders are Non-Cancelable and Non-Refundable.